#include <stdio.h>

int main(int argc, const char *argv[])
{
	unsigned int a = 10;
	signed int b = -20;
	
	// 下面的代码会输出 yes
	if(a + b > 0){
		printf("yes\n");
	}else{
		printf("no\n");
	}

	return 0;
}
